Upgrade to some new nextcloud standards

lib/Controller/Errors.php

@@ -0,0 +1,24 @@
+<?php
+
+namespace OCA\QuickNotes\Controller;
+
+use Closure;
+
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\DataResponse;
+
+use OCA\QuickNotes\Service\NotFoundException;
+
+
+trait Errors {
+
+	protected function handleNotFound (Closure $callback) {
+		try {
+			return new DataResponse($callback());
+		} catch(NotFoundException $e) {
+			$message = ['message' => $e->getMessage()];
+			return new DataResponse($message, Http::STATUS_NOT_FOUND);
+		}
+	}
+
+}